>>41377162 (OP)
You need to move your current mind back into your body, ONLY WORKS WITH THE SAME TISSUE, your own body in the past.
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This is the only way time-travel works.
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It ONLY WORKS with YOU and YOUR mind and you cannot further back than the last neuronal update; loss of synapses.
You cannot move into you as a child, in your adolescence nor your late 20s as those periods are ones of intense synapse gain and loss.
Hope this helps.
>UK 1971 Project Carpathian and Project Scandium Road